Kanji 理 logic, arrangement, reason Related words 夫ふう 婦ふ 円えん 満まん 夫婦円満 refers to a harmonious married life in general, while 比翼連理 specifically emphasizes the deep, fated bond and eternal commitment between spouses.
偕かい 老ろう 同どう 穴けつ 偕老同穴 also expresses a wish to be together until death, but 比翼連理 focuses more on the poetic imagery of inseparable union rather than the lifelong aspect.
Etymology A yojijukugo derived from classical Chinese poetry. 比翼 (paired wings) comes from the legendary bird that has only one wing and one eye, requiring a pair to fly, symbolizing an inseparable couple. 連理 (intertwined branches) refers to two trees whose branches grow together, representing a union that cannot be parted. Together they form a metaphor for a deep marital bond.
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